Finally..pics of new RCGF 10cc gasser
#26
I think you can rotate the cylinder/head as needed for left or right exhaust or rear exhaust. Maybe even front exhaust too. I will likely buy one just to play with and see how it works and runs. Maybe even fly in a plane some too.
#27
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That would be a neat feature, but when considering to rotate a cylinder, there's transfer porting to be matched, as well as ensuring there's no danger in hooking a ring. Be nice IF all of that's been considered, but that's a pretty big "if" from where I'm sitting.
Noticed they have a pretty optimistic rpm showing for a 13x6 prop. Be nice if it will actually do that in the field. -Al
Noticed they have a pretty optimistic rpm showing for a 13x6 prop. Be nice if it will actually do that in the field. -Al
#28
Well they used Circlips on the wrist pin so it won't be a problem. Now if the piston isn't pinned to lock the ring into one position, then the ring is free to move around until it seats itself.
So unless they made the crankcase too small for the transfer port passages, then rotating the cylinder/head should not be a problem. Now a limiting factor might be if the piston is asymmetrical and has longer skirt on one side or the other. Then it would need a side exhaust versus rear exhaust piston.
So unless they made the crankcase too small for the transfer port passages, then rotating the cylinder/head should not be a problem. Now a limiting factor might be if the piston is asymmetrical and has longer skirt on one side or the other. Then it would need a side exhaust versus rear exhaust piston.
#29
My Feedback: (2)
It's my understanding that the reason you would pin the ring, is to prevent the potential for the ring gap to be exposed to a port. If that were to occur, cases of "snagged" rings would be commonplace (with disastrous results/destroyed engines). I can't say I've ever seen a 2 stroke piston where the ring was free to turn/"seat" itself. 4 strokes a different story.
Regarding transfer ports, commonly, the design of the crankcase includes areas machined to enhance air flow to the transfer ports (front, rear, and the side opposite the exhaust port). Because generally there are no transfer ports on the exhaust side, there's no need for this machine work on the exhaust port side of the crankcase. So, if we turn the cylinder 90 degrees, even if everything else works out, your 3rd set of transfer ports have been blocked. In this case, the ones that were originally in the front of the cylinder.
These are both of the commonly found issues when considering turning the cylinder. Not having seen this one, not saying either is the case here, only that I'd be pleasantly surprised if that were not the case here..... -Al
Regarding transfer ports, commonly, the design of the crankcase includes areas machined to enhance air flow to the transfer ports (front, rear, and the side opposite the exhaust port). Because generally there are no transfer ports on the exhaust side, there's no need for this machine work on the exhaust port side of the crankcase. So, if we turn the cylinder 90 degrees, even if everything else works out, your 3rd set of transfer ports have been blocked. In this case, the ones that were originally in the front of the cylinder.
These are both of the commonly found issues when considering turning the cylinder. Not having seen this one, not saying either is the case here, only that I'd be pleasantly surprised if that were not the case here..... -Al
#30
Actually there are quite a few two stroke engines that use unpinned rings. One has to be careful as you can run across engines with a pinned piston/ring that might mess up your day, if you weren't paying attention. If I remember correctly, they put a very tiny slight taper on the ring ends and that keeps them from getting into a open port. Also they may use more webs in the ports too.
#39
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I just bought an RCGF 15CC BM last month for $189 from BP Hobbies ($204 shipped). I saw that they advertised the RCGF 10CCBM for $179.95 but not in stock yet. When? I have yet to start my 15CC, does anyone have any experience with the RCGF 15CC? Any thaught would be appreciated.
Thanks, Dave
Thanks, Dave
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A member of my club bought an early version of the RCGF 15 and had the following experience:Crank shaft threads shredded,( repaired by the company), Carburetor problems ( company furnished new carb.), after which he flew the engine for the next two seasons with no problems. Dependable and excellent power when broken in properly. His was an early engine and obviously had teething problem which I would judge to be resolved in later engines. My.02.
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Earlyish RCGF 15cc I have in a HK Hien. Starts easily, has never failed and feels reasonable quality. Simple porting and reed valve design. 14*7" prop is about right. I'd recommend for a first gasser and have no trouble with it.
DLE20 is much more powerful, but a little more money.
The 10cc looks interesting for a 40 size plane
DLE20 is much more powerful, but a little more money.
The 10cc looks interesting for a 40 size plane
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#47
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